I had to watch each expression an average of five times before I had a clue as to what it was. The one that I was able to correctly identify right away was the guy with the "disgust" face, because while I was watching him, the program stalled, and I saw that his nose was wrinkled, and I've read that disgust is manifested by a wrinkled nose.
Like Callista said, I found myself trying to analyze the expressions because I was not able to process them while they were happening.
I remember reading about Dr. Paul Ekman, who pioneered this research on "microexpressions," in a New Yorker article by Malcolm Gladwell about six or seven years ago. Part of the article discussed a policeman with an ability to detect microexpressions who used this skill to determine whether or not a young man with a gun was about to shoot him. Although the young man had gotten out of his car with his gun drawn and was pointing it at the police officer, the officer didn't shoot. The officer described that something didn't feel right, and that he somehow knew that the young man was not a threat. He was right -- after a minute, the young man lowered his gun.
Clearly, reading microexpressions can be useful, especially if you are in a job or a life situation where it is necessary to quickly analyze someone's face. However, it is not only we on the spectrum that have difficulty reading microexpressions -- I've read that many neurotypicals have difficulty reading them, as well.
Judging from this test, I have difficulty reading microexpressions, and this may contribute to my difficulties in managing social situations. However, there are non-aspies who have trouble reading microexpressions who are able to handle social situations just fine. I think that reading microexpressions is a useful but not essential part of interacting with other people, and that other factors may play a more significant role in determining one's abilities to interact socially.
In my case, my difficulties in reading facial expressions and body language do not affect my social interactions as much as the fact that I tend to overwhelm/overstimulate very quickly, and being around other people is an overstimulating environment that I want to get away from as fast as possible.
My $0.02.
~ Caterina
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"I've never been asked to belong. I've never joined anything except the Marvel Comics Club, but that was through the mail and even then they lost my membership."
~ Eleanor, from Starmites